diff --git a/addons/web/static/lib/qweb/qweb-test-extend.xml b/addons/web/static/lib/qweb/qweb-test-extend.xml
index dfd0ec46940..f8a24c4ef8e 100644
--- a/addons/web/static/lib/qweb/qweb-test-extend.xml
+++ b/addons/web/static/lib/qweb/qweb-test-extend.xml
@@ -37,7 +37,26 @@
         <t t-jquery="ul" t-operation="append"><li>[[cloned template]]</li></t>
     </t>
     <result id="jquery-extend-clone"><![CDATA[
-    <ul><li>one</li><li>[[cloned template]]</li></ul>
+    <hr/><ul class="main" title="Main Title" name="main-ul"><li>1</li><li>2</li><li>3</li><li>[[cloned template]]</li></ul><footer><b>[[end]]</b></footer>
 ]]></result>
 
+
+    <t t-name="a">
+        <div><span>Hi</span></div>
+    </t>
+    <t t-name="b" t-extend="a">
+        <t t-jquery="span" t-operation="after"><i>World</i></t>
+    </t>
+    <t t-name="c" t-extend="b">
+        <t t-jquery="span" t-operation="replace"><span>Hello</span></t>
+    </t>
+    <result id="a"><![CDATA[
+    <div><span>Hi</span></div>
+]]></result>
+    <result id="b"><![CDATA[
+    <div><span>Hi</span><i>World</i></div>
+]]></result>
+    <result id="c"><![CDATA[
+    <div><span>Hello</span><i>World</i></div>
+]]></result>
 </templates>
diff --git a/addons/web/static/lib/qweb/qweb2.js b/addons/web/static/lib/qweb/qweb2.js
index 2cfd2286cbc..d2a367f1c33 100644
--- a/addons/web/static/lib/qweb/qweb2.js
+++ b/addons/web/static/lib/qweb/qweb2.js
@@ -268,6 +268,7 @@ QWeb2.Engine = (function() {
                             return this.tools.exception("Can't clone undefined template " + extend);
                         }
                         this.templates[name] = this.templates[extend].cloneNode(true);
+                        this.extend_templates[name] = (this.extend_templates[extend] || []).slice();
                         extend = name;
                         name = undefined;
                     }